Design and Implementation of a Self-Securing Storage Device (CMU-CS-00-129)

Self-securing storage prevents intruders from undetectably tampering with or permanently deleting stored data. To accomplish this, self-securing storage devices internally audit all requests and keep all versions of all data for a window of time, regardless of the commands received from potentially compromised host operating systems. Within the window, system administrators are guaranteed to have this valuable information for intrusion diagnosis and recovery. The S4 implementation combines log-structuring with novel metadata journaling and data replication techniques to minimize the performance costs of comprehensive versioning. Experiments show that self-securing storage devices can deliver performance that is comparable with conventional storage. Further, analyses indicate that several weeks worth of all versions can reasonably be kept on state-of-the-art disks, especially when di erencing and compression technologies are employed. The authors would like to thank the member companies of the Parallel Data Consortium (CLARiiON Array Development, EMC Corporation, Hewlett-Packard Labs, Hitachi, In neon Technologies, Intel Corporation, LSI Logic, MTI Technology Corporation, Novell, Inc., PANASAS, L.L.C., Procom Technology, Quantum Corporation, Seagate Technology, Sun Microsystems, Veritas Software Corporation, and 3Com Corporation). The authors also thank IBM Corporation and CMU's Data Storage Systems Center for their support of this project.